Research on Entropy Coding of Three DimensionaI DCT of CoIor Image
In the compression system of three dimensional discrete cosine transform, there are lots of long zero run-lengths of alternating current coefficients, which are encoded by run length coding, traditional entropy coding method in JPEG based on the statistics of (Run, Level ) is not suitable. By path of the study of distribution of AC, proposes the improved entropy coding algorithm based on jointly probability of (Run Level, Level), the size of code table is moderate, code table in JPEG is multiplexed, and there is great potential in the higher dimensional transform compression field of video image in further. According to the non-uniformity of non-zero coefficient and the analysis of coding efficiency, the scattered and clustered areas of non -zero coefficients are coded with different methods. The experiment results show that, when the peak signal and noise ratio is the same, there is 11% code rate savings compared with the Baseline of JPEG standard.
Run Length CodingEntropy Coding3D-DCTImage Compression
NETL
NSTL
万方数据
维普
